As the initial level ahead \(u_{+}\)  decreases in the CDSW regime, the effect of the shed resonant wavetrain grows until the
DSW itself ceases to exist and there is just a large amplitude resonant wavetrain with a small amplitude wave at its trailing
edge linking it to the intermediate level, as shown in Figure REF (d).
This is similar to the behaviour of the DSW for the Kawahara equation (REF ) for which the DSW ceases to exist for
large enough initial steps (or small enough \(\mu \) ). The DSW is replaced by what is termed a TDSW, a travelling dispersive shock
wave [1]}. This work on the Kahawara equation shows that in the TDSW regime the DSW largely disappears, with a
single remnant negative polarity solitary wave connecting the resonant wavetrain to the intermediate level \(u_{i}\) . The
same structure is seen in Figure REF (d) for the nematic TDSW regime.
